I want to get a laptop touchpad to work on my desktop via parallel port or ps/2, I want to install it on my old keyboard. I've figured out that
Synaptics makes the majority of laptop touchpads, so I've been searching for drivers for their touchpads and I'm pretty sure I've found the universal driver for most of their touchpads to work on XP. I really don't know where to go from there. Any help would be greatly appreciated.

Think I should just order it and try to find the pinout on my own?
hrmm

Looks like you would run into a little trouble with Pin 1...since the mouse microcontroller on a regular PS/2 mouse sends 3 data packets through pin 1, so you'd have to program a small microcontroller to translate the button clicks, etc along with the movement, or better yet, rip one that is already programmed out of another PS/2 mouse! That might prove to be easier.
Let me know how it works, this is interesing.__________________ _ . . . . . . _ _

Interesting project, if it is the same as this one looks like it might be trivial to hook up. Hope I haven't jinxed it though since everything that I think will be super easy ends up being the project that gets shelved because of over complexity...